On Mon, Jul 19, 2010 at 12:47 AM, coltsith <conla...@gmail.com> wrote:
> Well I want to have a sorted list of all the accounts, since I will
> have a sort of 'bulletin board' of ranked users. Like a Top 100 list.
>
Just do a query for what you want. Example:
top100 = User.all().order('-awesomeness').fetch(100)
If you are concerned about the performance of doing this query often, then
store the results in memcache.
Perhaps I should just have an object with a sorted list of the user
> ids instead?
>
> On Jul 15, 1:37 pm, Chris Copeland <ch...@cope360.com> wrote:
> > This is probably not a good idea. What are your access pattens for this
> > entity? How many accounts do you usually need to retrieve at once? How
> > often is an account updated?
> >
> > If you normally access just a few accounts, then you are incurring the
> cost
> > of retrieving all of them every time unnecessarily.
> >
> > When you need to update an account you are incurring the cost of
> > deserialization/serialization for the entire list. This will also lead
> to
> > contention when multiple users are updating their accounts.
> >
> > -Chris
> >
> >
> >
> > On Wed, Jul 14, 2010 at 11:46 PM, coltsith <conla...@gmail.com> wrote:
> > > I had an idea the other day, but know there's probably some issue I'm
> > > not realizing.
> >
> > > Let's say you have an Account object that represents a registered
> > > user. Instead of having multiple Account objects that you persist to
> > > the datastore, why not have 1 object (ie AccountList) that you
> > > persist, and that object has an array all the Accounts.
> >
> > > So if you want to pull up multiple Accounts or even all of them, it's
> > > just 1 query to the datastore to get AccountList.
> >
> > > What major issues (if any) would I run into using this model?
> >
> > > Thanks
> >
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